Depends on model, barrel/sights, and condition. Anywhere from $100 for a well used Mk1 to $400 for a NIB stainless heavy barreled Mk II with target sights.
Rifle or pistol?
Made in 1966.
0-300 usd
by serial number
50-250 usd
50-150 or so
65-190 USD
50-200 USD or so
10-150 USD or so
No. A pistol is designed to be used with one hand. A rifle is usually Automatic except for Sniper Rifles and Firearms of a similar type. However, a pistol is Semi-Automatic.
If Ruger's website is up, they have extensive sn data on it.
Ruger has a sn search function on their web site.